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We really appreciate your kind comment on our product service and we are truly grateful for your support to our company. We will be motivated to improve ourselves and serve you better in the future.

A simple box for serial connecting two 18650 batteries to get 7.4V DC power, e.g., for DIY projects. It works as expected, though the batteries fit rather tightly in the box, especially sideways, so the batteries can be difficult to get out of the box, but this probably also means that the batteries will not easily fall out of the box by mistake.
A simple box for serial connecting two 18650 batteries to get 7.4V DC power, e.g., for DIY projects. It works as expected, though the batteries fit rather tightly in the box, especially sideways, so the batteries can be difficult to get out of the box, but this probably also means that the batteries will not easily fall out of the box by mistake.

Battery Box came on time, works well with 2 18650 and you can also put 4 16650 ( half size 18650 ) batteries to get +15 v too.
Battery Box came on time, works well with 2 18650 and you can also put 4 16650 ( half size 18650 ) batteries to get +15 v too.